The DVI socket on my monitor is broken, so I decided to use the VGA socket.
I used a DVI-VGA adapter on my graphic card end, since it only has 2 DVI sockets.
It works but the resolution I can see from display property only goes up to 1600x1200, where I had 1920x1080 when using DVI.
My question is:
What is the maximum resolution supported, when going through a DVI-VGA adapter?
Is 1600x1200 the top, or something is wrong with my adapter/socket/cable/driver?
Answer
1600x1200 is the maximum supported resolution for UXVGA. The maximum support resolution for VGA is 640x480. The adapter is not relevant for resolution. It will be the output of the device. You can see an example of a UXGA cable below.
As you can see by the following picture of a VGA cable, they are almost identical (and WOW that is a huge picture...). These both use the HD15 connector.
The monitor you are using is UXGA compatible which can take resolutions from an HD15 all the way up to UXGA (highest rated interface for HD15 cables). This is why you can get a high resolution out of a VGA cable, they are compatible.
Please note that you can get a higher resolution using some tools, but it will look horrible. The following are supporting sources.
The following is a great chart that shows maximum support resolutions for many interfaces. 
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